Fig. 5

Combined nomogram and calibration curve of the enhanced CT. a The developed combined nomogram to predict the probability of the differential diagnosis between the anterior mediastinal cysts and type B1 and B2 thymomas. By summing the scores of each point and locating it on the total score scale, the estimated probability of the differential diagnosis could be determined; b, c calibration curves to predict the training and test datasets. The 45° straight line represents the perfect match between the actual (y-axis) and nomogram-predicted (x-axis) differential diagnosis probabilities. A closer distance between two curves indicates higher accuracy prediction and actual observation for the anterior mediastinal cysts and type B1 and B2 thymomas in both the training and test datasets